I have a 2001 S40 Turbo. I was driving the other day and I noticed the temperature gauge starting to climb and by the time I got stopped the gauge was almost pegged, and then the upper radiator hose blew. I replaced the upper radiator hose. Upon starting the vehicle, to start adding coolant, I noticed the water pump making "clackity" sounds. I wasn't sure if it was just because it was empty of fluid. The sound has now gone away, however, the heater will not blow hot, and the car over heats when driven an small distance. I bled the system of air the best as possible. The upper radiator hose gets hot, the lower stays cold. I bought this car used, and have no idea if the water pump was ever changed. The car has 160,000 miles on it. Any help would be greatly appreciated .

My question is: are these water pumps known to detach the impeller? Or stop flowing the coolant?

Many thanks,
Chanel

 

It does sound like you have a water pump and/or thermostat issue. The pumps are not known to detachment problems. A new pump and thermostat would be about $70 but has the timing belt been done with 160k mikes? Is there any pressure buildup in the system (remove expansion cap) after a short while?

 

Do you think the sound from the waterpump could have been caused through sludge / scale from the engines water jackets coming free when the radiator hose burst suddenly and contacting the pumps spinning impellor as coolant circulates?
The pump is a prime suspect naturally but i'd start by renewing the thermostat first.
also check the overflow reservoir and especially its cap.
If the pump does require renewing you may be wise to check out your cambelt,tensioner,seals etc whilst your working in that area of the engine also.
Sadly that makes it more expensive of course but may save inconvenience further down the track.